According to the hotel information we received at checkin, you do need to have a laptop to use the internet in your room. You should not have to bring a cable (there was one in the desk drawer, with a warning that you will be charged if it disappears during your stay). There is no charge for access from your room (it is included in the resort fee).
I believe I also read on the hotel information sheet that there is also internet access available at through the Conference Center (may not need a laptop for that, but there is probably a charge associated with it). There is also wireless access in a couple of places.